The lawsuit, Torres vs. Greystar Management Services LP, was filed Monday in a U.S. District Court in San Antonio. Greystar Management Services is a subsidiary of Greystar Real Estate Partners LLC, the lawsuit said.

"Greystar failed to make plan investment decisions based solely on the merits of each investment and in the best interests of plan participants," the lawsuit said. Greystar also "failed to ensure the plan was invested in the lowest-cost investment vehicles."

Megan Kivlehan, a Greystar spokeswoman, did not respond to requests for comment.

The Greystar 401(k) Plan, Irving, Texas, had assets of $189.2 million as of Dec. 31, 2017, according to the latest Form 5500 filing.